20675591 has 8 divisors (see below), whose sum is σ = 21840000. Its totient is φ = 19518840.

The previous prime is 20675573. The next prime is 20675593. The reversal of 20675591 is 19557602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20675591 - 2⁶ = 20675527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20675593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4160 + ... + 7658.

It is an arithmetic number, because the mean of its divisors is an integer number (2730000).

Almost surely, 2^20675591 is an apocalyptic number.

20675591 is a deficient number, since it is larger than the sum of its proper divisors (1164409).

20675591 is a wasteful number, since it uses less digits than its factorization.

20675591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 20675591 is about 4547.0420055240. The cubic root of 20675591 is about 274.4643722914.

The spelling of 20675591 in words is "twenty million, six hundred seventy-five thousand, five hundred ninety-one".